bg-image($url)
  background-image: url($url + "@2x.png")
  @media (-webkit-min-device-pixel-ratio: 3),(min-device-pixel-ratio: 3)
    background-image: url($url+"@3x.png")

border-bottom($color)
  position relative
  &:after
  	display block
  	position absolute
  	width 100%
  	left 0
  	bottom 0
  	border-top 1px solid $color
  	content ''

border-right($color)
  position relative
  &:after
  	display block
  	position absolute
  	height 100%
  	right 0
  	top 0
  	border-right 1px solid $color
  	content ''
  	
border-none()
  &:after
  	display none

  	